BMW 3: Climate Control
BMW 3 Series G20 (2018-2025) Training manual / Climate Control
As in previous BMW hybrid vehicles, an electrically powered air conditioning compressor is used in the G20 PHEV. Because the A/C compressor has an electric motor, it is possible to operate the air conditioning independently of the combustion engine. Thus the customer can enjoy the cooling effect of the air conditioning even while driving in pure electric mode and while stopped.
The high-voltage battery unit is cooled by the vehicle's refrigerant's circuit.
The stationary climate control is also available in the G20 PHEV.
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System overview
G20 PHEV, components of refrigerant circuit
Combined expansion and shutoff valve (interior)
Combined expansion and shutoff valve (high-voltage battery unit)
High-voltage battery unit
Refrig
Electric A/C compressor
Electric A/C compressor (EKK)
Signal connector
Low pressure line (gaseous refrigerant at low temperature and low
pressure)
High-voltage connector
High pressure line (gaseous refrigerant at hig
Stationary cooling
Owing to the fact that the air conditioning compressor in the G20 PHEV is
electrically operated and
that the high-voltage battery unit has high energy and power densities, a
stationary climate
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Warning with braking function
Display
If a collision with a pedestrian or a cyclist is imminent,
a warning symbol appears on the instrument
cluster and in the Head-up Display.
The red symbol is displayed and a
signal
sounds.
Alternatively, depending on the
vehicle
equipment, a red warning triangle lights
up in the instrument
DC/DC converter
The DC/DC converter in the Electrical Machine Electronics of the G20 PHEV is
able to adopt the
following operating modes:
Standby (also in the event of a component fault or short circuit, power
electronics off)
Buck mode (energy flow to the low-voltage side, converter adjusts
voltage on
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